Date: Tue, 21 Sep 1999 17:27:16 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Brian Dean <brdean@mindspring.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: how to shut down a TCP connection Message-ID: <199909220027.RAA09627@apollo.backplane.com> References: <199909212245.SAA02737@vger.foo.com>
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:Hi,
:
:I'm doing TCP development on a custom operating system that I've
:written and am using my FreeBSD box for testing my TCP stack. I'm in
:the early stages right now and I have a lot of bugs. One of my bugs
:is that I shut down a connection on my end but I'm doing something
:wrong and the connection on the FreeBSD side stays up, i.e.:
:
:[bsd@vger]:/net- netstat
:Active Internet connections
:Proto Recv-Q Send-Q Local Address Foreign Address (state)
:tcp 0 0 vger.telnet bos.5000 ESTABLISHED
:
:'vger' is my FreeBSD machine and 'bos' is my experimental OS. The
:connecton on 'bos' at this point is actually closed.
:
:Does anyone know how I can manually shutdown the above connection on
:'vger' short of waiting a really long time or rebooting?
:
:Thanks,
:-Brian
:--
:Brian Dean brdean@mindspring.com
Turn on keepalives and set the parameters really low so the connection
times out after a couple of minutes. Experiment. Remember that the
below will effect all your TCP connections, so don't make the timeout
too low.
sysctl -w net.inet.tcp.always_keepalive=1
sysctl -w net.inet.tcp.keepintvl=60
sysctl -w net.inet.tcp.keepinit=60
sysctl -w net.inet.tcp.keepidle=300
If the FreeBSD side is still in the ESTABLISHED state, it is not
getting a FIN or not getting a proper FIN.
-Matt
Matthew Dillon
<dillon@backplane.com>
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